notices in code and page title "Sentence case" standard and trailing whitespace and more robust configuration check

There's a handful of notices in the code which I'm fixing and changing the menu titles to be "Sentence case" which is the standard and removing trailing whitespace from any lines. I also added a more robust check that the users have actually configured the site.

The one I'm least certain about is the change in security_review.checks.inc in security_review_check_comments.